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Factorisation of Polynomials — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsFactorisation of Polynomials2 Marks
Question
Factorise:
64a3 - 343
✓

Answer

64a3 - 343
= (4a)3 - (7)3
= (4a - 7)[(4a)2 + (4a)(7) + (7)2]
= (4a - 7)(16a2 + 28a + 49)
= 64 + 112 + 196a - 112 - 196a - 343
= 64a3 - 343

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